// Copyright (c) 2011, François Saint-Jacques. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
//     * Neither the name of the disruptor-- nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL FRANÇOIS SAINT-JACQUES BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include <memory>
#include <vector>

#include "disruptor/exceptions.hpp"
#include "disruptor/interface.hpp"

namespace market { 
    namespace disruptor {

        class ProcessingSequenceBarrier : SequenceBarrierInterface {
            public:
                ProcessingSequenceBarrier(
                    WaitStrategyInterface* wait_strategy,
                    Sequence* sequence,
                    const std::vector<Sequence*>& sequences
                ) : cursor_(sequence),
                    wait_strategy_(wait_strategy),
                    dependent_sequences_(sequences),
                    alerted_(false)
                {}

                virtual int64_t
                WaitFor(
                    const int64_t& sequence
                )
                {
                    return wait_strategy_->WaitFor(
                        dependent_sequences_,
                        *cursor_,
                        *this,
                        sequence
                    );
                }

                virtual int64_t 
                WaitFor(
                    const int64_t& sequence,
                    const int64_t& timeout_micros
                )
                {
                    return wait_strategy_->WaitFor(
                        dependent_sequences_,
                        *cursor_,
                        *this,
                        sequence,
                        timeout_micros
                    );
                }

                virtual int64_t
                GetCursor() const
                {
                    return cursor_->sequence();
                }

                virtual bool
                IsAlerted() const
                {
                    return alerted_.load(std::memory_order::memory_order_acquire);
                }

                virtual void
                Alert() {
                    alerted_.store(true, std::memory_order::memory_order_release);
                }

                virtual void
                ClearAlert() {
                    alerted_.store(false, std::memory_order::memory_order_release);
                }

                virtual void
                CheckAlert() const {
                    if (IsAlerted()) { 
                        throw AlertException();
                    }
                }

            private:
                WaitStrategyInterface* wait_strategy_;
                Sequence* cursor_;
                std::vector<Sequence*> dependent_sequences_;
                std::atomic<bool> alerted_;
        };
    } // namespace disruptor
} // namespace market
